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I am running a hello-world http server on an ubuntu EC2 instance, let's say, myurl.com. I am unable to curl it from my client:

$ curl myurl.com:4296 curl: (7) Failed to connect to myurl.com port 4296: Connection refused

When I try to reach any other port, my connection is timed out:

$ curl myurl.com:4244 curl: (7) Failed to connect to myurl.com port 4244: Operation timed out

I have the following inbound rule on AWS:

enter image description here

I am able to curl it on the server:

$ curl localhost:4296 Hello World

My netstat:

$ netstat -a | grep 4296 tcp 0 0 localhost:4296 0.0.0.0:* LISTEN

What am I doing wrong?

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  • Does this answer your question? What causes the 'Connection Refused' message? Commented Aug 12, 2021 at 12:14
  • @MichaelHampton none of the answers to that linked question mention the reason for the OP's problem - his program listening on the localhost address only. This is not a duplicate. Commented Aug 12, 2021 at 21:51

2 Answers 2

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The process on port 4296 listens only on the localhost / 127.0.0.1 address and therefore is not accessible from outside. You have to change the configuration (or the program itself if it's one that you wrote) to listen on 0.0.0.0 - that will make it listen on all addresses.

Here's an example from my system:

~ # netstat -tnlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1311/sshd tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 1183/cupsd

Here SSH listens on port 22 on all addresses and is therefore accessible from outside (if firewall and SG permits of course).

On the other hand CUPS listens on port 631 only on the localhost (127.0.0.1) and even if firewall / SG allowed this port it wouldn't be accessible from outside.

Hope that helps :)

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Check whether are you able to access it with public up. If you are able to then you need to check whether route53 is correctly configured. If you can't with public ip also then add the firewall rule to allow the traffic. https://linuxdiaryblog.blogspot.com/2020/06/add-firewall-exception-to-port.html?m=1

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